Acquired this one today, Cham Tun from the Meitei people of Manipuri, an older and sharp version of the ones in the linked vides below.
53 cm. LOA, steel with wood haft wrapped in brass wire, brass disk om the pommel.
Manipuri thang Ta Martial Art video:
https://www.youtube.com/watch?v=ii9adOSloVc
'Nother:
https://www.youtube.com/watch?v=-srjwsP8yd8
More: these look like mine:
https://www.youtube.com/watch?v=mfbLJ6icQ_E
They are occasionally mistaken as 'African'.